This can be done by forcing the lamp up
the cement between the elements of the
lens appears to be fern-like when exam-
and down and sideways with the current
ined under a magnifying glass, replace
on. If the lamp flickers, repair or re-
the lens. If any other defects appear
place the socket. Side play may cause
the lamp to go out of focus. Examine
under examination with a magnifying
glass, replace the lens unless the defects
the connections to the socket, especially
occur only at the outer rim of the lens.
the connection to the shell of the socket.
(7) Photocell socket. Remove the pan under
Test the spring in the socket to be sure
the photocell and examine the socket
that it operatea freely to give a strong
contact pressure to the lamp.
connections.
c. Exciter Lamp Socket. Do not replace the
(3)
Socket mounting plate. Examine the
screws that hold the socket mount in
exciter lamp socket with any ordinary type auto-
place to be sure that they are set up
mobile socket. The socket must be constructed
tightly on the bakelite holder, There is
with strong springs behind the contact, and in-
a possibility that the bakelite may have
sulated with bakelite, not hard rubber.
d. Lamp Bracket. If it is necessary to tighten
shrunk away from the screws, causing
them to become loose.
the lamp bracket, keep in mind that the eccentric
action of the top screw moves the bracket side-
Lamp holder bracket assembly. T h e
(4)
bracket assembly must not move when a
ways, and the eccentric action of the bottom screw
pressure of approximately 10 pounds is
raises and lowers the bracket. The center operat-
applied by hand. If it does move, spring
ing position of the screw heads is marked with a
red dot. Do not attempt to obtain alinement
tension (L) under the cam screws (G)
and (F) (fig. 120) is too light. The ten-
with the red dot one-fourth or one-half turn off
sion may be increased by taking 1 full
center. The dot should not move more than 45
either side of center. If it is necessary to take up
turn on the screw. It is possible that
the spring leaves may be broken. If so,
a turn on either the lower or upper cam screw, it
replace them.
may be necessary to make a partial turn of the
second cam to obtain a complete revolution of the
(5)
lens for dirt and improper fitting in the
first one. This holds true if one cam is removed
to replace a spring. Under emergency conditions,
mount.
(6)
Objective lens barrel. Inspect the objec-
a spring may be replaced with a heavy piece of
tive lens for dirt and fitting in the mount.
rubber that has a thin washer on each side.
The barrel must not be loose in the block.
Inspect the lens for defects. It may be
denser lens may be cleaned sufficiently for opera-
necessary to remove the lens barrel. If
tion by dusting off the top surface and wiping it
